The Impact of Mobile Multimedia Applications on Data Center Consolidation
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1 The Impact of Mobile Multimedia Applications on Data Center Consolidation Kiryong Ha, Padmanabhan Pillai, Grace Lewis, Soumya Simanta, Sarah Clinch, Nigel Davies, and Mahadev Satyanarayanan Carnegie Mellon University, Intel Labs, CMU-SEI, Lancaster University 3/27/2013
2 Consolidation is the key to Cloud computing Cloud computing achieves economies of scale by consolidating resources It lower the marginal cost of operation and management Amazons EC2 spans the entire planet with 7 data centers Large separation between a mobile device and its cloud High latency in end-to-end communication Challenges for latency sensitive applications From 3/27/2013 2
3 Emerging Mobile Applications A new class of applications using video/voice in mobile context Apple s Siri, Augmented reality applications Many of these are interactive as well as resource-intensive Beyond the processing and storage limits of mobile device Use Cloud to offload execution Wearable Devices like Google Glass will push this trend more From and 3/27/2013 3
4 Questions 1. Do we really need to offload? 2. What s the effect of Cloud location? 3. In situation where public Clouds are inadequate, what would be an alternative Cloud architecture? 3/27/2013 4
5 Applications Studied Applications Resource intensive and latency sensitive applications Application Input Output Execution Environment Face Recognition Image Name and position of a detected face OpenCV on Windows Speech Recognition Audio Words in plain text format Java on Linux Object Recognition Image Names and positions of found objects C++ on Linux Augmented Reality Image Name (information) of recognized landmark OpenCV & Intel IPP on Windows Fluid Simulation Acc data Location and pressure of simulated particles C++ on Linux 3/27/2013 5
6 1. Do we need to offload? Extremes of resource demands It may appear that today s smartphone are already powerful enough Built-in support for face detection in Android SDK But, computation varies dramatically depend on operational conditions Face recognition 1. Increasing number of possible faces, 2. Reducing the constraints on the observation conditions 3/27/2013 6
7 1. Do we need to offload? High variability of execution time 1. SPEECH recognition Execution time increases with the number of recognized words 2. FACE recognition no words recognized 1-5 words recognized Execution time varies depends on the contents of images 6-22 words recognized Measured average time s 1.04 s 4.08 s Image with single big face Image with no face 0.30 s 3.92 s * Tested with a netbook as a mobile device 3/27/2013 7
8 1. Do we need to offload? Improvement from Cloud offloading Though variability still exists, the absolute response times are improved SPEECH (500 requests) FACE (300 requests) No Cloud With Cloud median 99% median 99% 1.22 s 6.69 s 0.23 s 1.25 s 0.42 s 4.12 s 0.16 s 1.47 s * We used Amazon EC2 for SPEECH and private Cloud for FACE. ** We used netbook as a mobile device. 3/27/2013 8
9 Experiment setup 2. Effects of Cloud location Mobile (No offloading) : Local execution within mobile device Cloud : Offload to Cloud (Amazon EC2) 4 locations: US-East, US-West, EU, Asia 1WiFi (One hop) : Offload to nearby compute resource n 1WiFi Xeon GHz KVM with 4 cores, 4 GB RAM Mobile Device Dell Latitude 2120(netbook) Intel Atom Ghz 4 cores, 2GB RAM Cloud Amazon X-large instance 20 EC2 computing unit 8 virtual cores, 7GB RAM Fast mobile/cloud and a slow Cloudlet configuration 1 EC2 Compute Unit GHz 2007 Xeon processor 3/27/2013 9
10 2. Effects of Cloud location Network measurement Average RTT from 260 global vantage points to an optimal Amazon EC2 instance is ms [1] [CMU Amazon East] has amazingly good connection, but becomes similar with Amazon West case if it is measured off-campus EC2 Throughput (Mbps) Latency (RTT, ms) To From median East West EU Asia < From mobile to different Cloud via n > 3/27/
11 Fraction of response Impact on response time Augmented Reality - CDF(Cumulative distribution function) of 100 requests in response time Time (ms) 3/27/
12 Fraction of response Impact on response time Fluid Simulation - CDF of 10 minutes simulation Time (ms) * Video available at 3/27/
13 Joule / query Impact on Energy Usage Energy consumption per query on mobile device Reduce energy consumption by a factor of 3 in 1WiFi Offload to far Cloud wastes energy while waiting the response AR Fluid Simulation Mobile 1WiFi East West EU Asia * netbook s baseline idle power dissipation is 10W 3/27/
14 Effects of Cloud location Proximity to the data center is essential Response time & Energy consumption 1WiFi Cloud The best attainable proximity The emerging of such applications can be accelerated by deploying infrastructure that assures continuous proximity to the cloud Contradictory requirements 1WiFi is valuable for mobile computing However, it needs many data centers at the edges the Internet Lowers the advantages of consolidation How can we reconcile this conflict? 3/27/
15 3. What s an alternative Cloud architecture? Hierarchical organization of data center Level 1 Today s unmodified Cloud Level 1 Data Centers (Amazon EC2) Level 2 Stateless data centers at the edge Appliance-like deployment model Internet 1. Only soft state Cached virtual machine images Cached files from DFS 2. No hard state keeps management overhead low. 1WiFi Level 2 Data Centers 1WiFi * soft state is state which can be regenerated or replaced 3/27/
16 3. Alternative Cloud Architecture Physical realization Hardware technology is already out today Repurpose as Level 2 data center by removing hard state and adding self-provisioning Myoonet s Outdoor micro data center [2] AOL s micro data center [3] 3/27/
17 3. Alternative Cloud Architecture Operating Environment Commonalities in the requirement between Levels 1 and 2 1. Strong isolation between untrusted user-level computations 2. Mechanisms for authentications, access control and metering 3. Dynamic resource allocation 4. The ability to support a wide range of user-level computations Virtual machine as Cloud of today like EC2 3/27/
18 Industrial efforts for 1WiFi Cloud Nokia Siemens Networks and IBM Announced Liquid Applications at MWC 2013 Deploys the cloud into the (cellular) base station Improved latency can enable high-value vertical solutions.. 3/27/
19 Discussion & Future work Rapid Provisioning Provisioning delay directly impact usability* Discovery How to dynamically find the right Level 2 data center? Data placement Appropriate data placement is important for many Cloud applications Two extreme ends 1. Application with relatively small data set for its operation 2. A very large data set accessed in an unpredictable manner Most applications likely fall between the two ends Map Data: physical location is highly correlated with accessed data map Automatic caching of distributed file system exploiting locality information * Kiryong Ha et al. "Just-in-Time Provisioning for Cyber Foraging", In MobiSys 2013 (to appear) 3/27/
20 Conclusion 1. Do we really need to offload? Cloud offload is here to stay 2. What s the effect of Cloud location? Emerging mobile applications endanger cloud consolidation 3. In situation where public Clouds are inadequate, what would be an alternative Cloud architecture? Hierarchical solution is desirable and feasible 3/27/
21 Reference 1) A. Li, X. Yang, S. Kandula, and M. Zhang, Cloudcmp: comparing public cloud providers, in Proceedings of the 10th annual conference on Internet measurement. ACM, 2010, pp ) Myoonet, Unique Scalable Data Centers, December 2011, 3) R. Miller, AOL Brings Micro Data Center Indoors, Adds Wheels, August ) Kiryong Ha, Padmanabhan Pillai, Wolfgang Richter, Yoshihisa Abe, Mahadev Satyanarayanan, "Just-in-Time Provisioning for Cyber Foraging", In MobiSys 2013 (to appear) 5) D. Kucera, Amazon apologizes for Christmas Eve outage affecting Netflix, December 2012, 6) M. Satyanarayanan, The Evolution of Coda, ACM Transactions on Computer Systems, vol. 20, no. 2, May ) S. Rhea, P. Eaton, D. Geels, H. Weatherspoon, B. Zhao, and J. Kubiatowicz, Pond: the oceanstore prototype, in Proceedings of the 2nd USENIX Conference on File and Storage Technologies, 2003,pp /27/
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